#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pii;
// const ll mod = 1e9 + 7;
// #include <brawlstars>
// FOR PAIN OR FOR GLORYYY ELLL PRIMOOOOOO

const int N = 1501;
int ans[N][N];

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int t, tringle[1501];
	tringle[0] = 0;
	for(int i = 1; i < 1501; i++) tringle[i] = tringle[i - 1] + i;
	cin >> t;
	while(t--) {
		int n, m, k, flip = 0, cur = 0;
		cin >> n >> m >> k;
		if(k * 2 > n * m) k = n * m - k, flip = 1;
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) ans[i][j] = 0;
		}
		for(int i = 0; i < m; i += 2) {
			if(cur == k) break;
			ans[0][i] = 1, cur++;
		}
		for(int i = 1; i < n; i++) {
			for(int j = i % 2; j < m; j += 2) {
				if(cur + 2 > k) break;
				ans[i - 1][j] = ans[i][j] = 1;
				cur += 2;
			}
		}
		if(k - cur) ans[n - 1][0] = 1;
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				cout << (ans[i][j] ^ flip);
			}
			cout << "\n";
		}
	}
}